General Description

The MAX1457 is a highly integrated analog-sensor signal processor optimized for piezoresistive sensor calibration and compensation. It includes a programmable current source for sensor excitation, a 3-bit programmable-gain amplifier (PGA), a 12-bit ADC, five 16-bit DACs, and an uncommitted op amp. Achieving a total error factor within 0.1 of the sensor’s repeatability errors, the MAX1457 compensates offset, full-span output (FSO), offset TC, FSO TC, and full-span output nonlinearity of silicon piezoresistive sensors.

Features

♦ High Accuracy (within ±0.1 of sensor’s repeatable errors)

♦ Compensates Offset, Offset TC, FSO, FSO TC, Temperature/Pressure Nonlinearity

♦ Rail-to-Rail® Analog Output for Calibrated, Temperature-Compensated Pressure Measurements

♦ Programmable Sensor Excitation Current

♦ SPI/MicroWire-Compatible Serial Interface

♦ Fast Signal-Path Settling Time (<1ms)

♦ Accepts Sensor Outputs from 5mV/V to 30mV/V

♦ Pin-Compatible with MCA7707